BezierSpline.java 文件源码

private static int[] getOutputPointsForNewerDevices(Point[] knots) {

        Point[] controlPoints = calculateControlPoints(knots);
        Path path = new Path();
        path.moveTo(0, 0);
        path.lineTo(knots[0].x / 255.0f, knots[0].y / 255.0f);
        path.moveTo(knots[0].x / 255.0f, knots[0].y / 255.0f);

        for (int index = 1; index < knots.length; index++) {
            path.quadTo(
                    controlPoints[index - 1].x / 255.0f,
                    controlPoints[index - 1].y / 255.0f,
                    knots[index].x / 255.0f,
                    knots[index].y / 255.0f
            );
            path.moveTo(knots[index].x / 255.0f, knots[index].y / 255.0f);
        }

        path.lineTo(1, 1);
        path.moveTo(1, 1);

        float[] allPoints = new float[256];

        for (int x = 0; x < 256; x++) {
            PathInterpolator pathInterpolator = new PathInterpolator(path);
            allPoints[x] = 255.0f * pathInterpolator.getInterpolation((float) x / 255.0f);
        }

        allPoints[0] = knots[0].y;
        allPoints[255] = knots[knots.length - 1].y;
        return validateCurve(allPoints);
    }